JPH0718105B2 - How to provide a friction and noise reduction interlining on a pitch cable - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method of welding friction and noise reduction interlinings on pitch cables, in particular wire ropes and spiral windings wound around the wire ropes. A method of wrapping a flocked filament or tape between turns of a pitch cable to provide a friction and noise reduction interlining on the pitch cable consisting of wires.

The prior art expression "pitch cable" refers to a toothed cable which is fastened to a wire rope and wound with a helically wound wire having a constant thread-like pitch.

Such pitch cables are used in operations using, for example, a galax / pinion driven pinion mesh having pitch helix windings. Illustratively, it is known to use such components to drive the sunroofs of vehicles, and it is known that pitch cables assume the function of a flexible galax guided in a tube.

A description of these pitch cables as used in sunroofs is given in German Patents 1283031 and 15757.
It can be ascertained by reference to No. 15 and German published application No. 3124444, the description of which is incorporated into the description by reference.

However, such a drive has the disadvantage that pitch cables tend to make noise in the guide tube. To suppress this undesired noise, it is already known from DE-A-3124444 to coat pitch cables with a noise-reducing layer of polymer foam.

Furthermore, German Patents 1283031 and 1575715 propose flocking (or short-fiber flocking) the inner wall of the guide tube with short fibers of a wear-resistant material.

However, both proposals have the drawback that their reduction is extremely difficult to implement. On the one hand, both the introduction of a uniform layer of polymer foam between the pitch cable and the inner wall of the guide tube and, on the other hand, the uniform flocking of the inner wall of the tube were successful (uniform noise reduction interlining between the pitch cable and the tube). ) Requires a great deal of technical effort not necessarily guaranteed.

JP-A-47-7569 (US Pat. No. 3,891,488) discloses that a universal joint sphere is completely bandaged with a binding thread of a low friction filament such as Teflon filament thread, and the filament thread is later used as a joint component. It has been described that a smooth surface or a slip surface is obtained by crimping to, in which case the Teflon layer provided reduces the friction between the joint components.

Problem to be Solved by the Invention An object of the present invention is to simply provide an interlining on such a pitch cable.

According to the invention, the flocked filaments consist of a thermoplastic and the pitch cable, before or after winding the flocked filaments, has a temperature above the melting point of the thermoplastic. Heat to melt the filament flock or fluff,
It is solved by welding to metal.

This method offers the particular advantage that the same flock thickness is achieved everywhere in the pitch cable if the filaments are uniformly flocked and that the winding of the filaments is very easy to carry out industrially. Flocked tape can be used in place of flocked filaments, and in some cases no flocking is necessary when the tape or filament is sufficiently thick and friable.

Tapes or filaments should be tightly wound to the extent that further tightening is unnecessary, or adhesive may be additionally applied to the pitch cable (preferably prior to winding of the filaments or tape). Instead of ensuring sufficient fixation of the filaments within, the pitch cable is heated above the melting point of the filaments to fuse the filaments into the groove of the spiral winding.

The welding or winding of filaments is carried out industrially in several ways. The pitch cable is rotated and either the filament or tape payout container, almost always the spool is stationary, or the pitch cable is stationary and the spool is rotated around the cable.

In a second means, such a switch is also possible, in which the cable is stationary and the spool is moved along the cable or is removed from the pitch cable or is stationary shortly.

These rotational and translational movements of the two members can be combined appropriately.

Next, this will be described with reference to the drawings.

FIG. 1 shows a pitch cable 1 with a threaded helical winding 2. A spool 4 holding a stock of flocked filaments 5 is rotatably supported on the carriage 3 adjacent to the cable. Adjacent to the spool,
On the carriage there is a nozzle 6 for pushing the adhesive into the thread groove of the helical winding.

The filament 5 is wound by rotating the cable 1 in the direction of arrow B, and the carriage 3 translates parallel to the cable in the direction of arrow C. Thus, apparently the filament 5 is not unwound from the spool 4 but is wound around a threaded helical winding. This is done after the adhesive is supplied from the nozzle 6 between the threads of the helical winding.

If no movement of the carriage 3 is required, i.e. the pitch cable rotates in the direction of arrow B and the cable also displaces in the direction of arrow D, the carriage may remain stationary.

Figures 2a to 2c show an apparatus for implementing the method in which a non-rotating but longitudinally displaced pitch cable is fed with flocked filaments. In this device, the pitch cable 1 moves through a plate 11 in the direction of arrow D. A spool 12 is fixed to this plate 11,
Both the plate 11 and the spool 12 rotate concentrically around the axis of the pitch cable 1 in the directions of the arrows U1 and U2. The counterweight 13 provides the necessary balance of weight. The speed of rotation of the plate 11 and the speed of advance of the pitch cable are adjusted precisely with respect to each other, taking into account the pitch of the helical winding, so that the filament 5 is precisely wound between the helical winding threads.

The other plate 14 is attached to the front of the plate 11 as viewed in the displacement direction of the cable 1, and supports the adhesive application nozzle 6. The plate 14 rotates synchronously with the plate 11. Alternatively, the nozzle 6 may be attached to the back surface of the plate 11.

The industrial equipment can be modified without departing from the scope of the inventive method. In particular, the plate 11 may be integral with the winder. In this case, the adhesive is applied before winding the helical winding, for example by means of an annular die which passes through the core and is blown onto the core of the pitch cable.

Proposed method (see German patent application P3513093.8)
Therefore, when the adhesive is used as shown in FIG. 1, it is difficult to accurately measure the amount of the adhesive. If too much adhesive is applied, the adhesive will rise between the threads to harden the flock on the filament. If insufficient adhesive is applied, there is a risk of the filaments peeling and unwinding.

Heating the cable above the melting point of the flocked thermoplastic filament results in a fixing method that does not have these drawbacks.

The heating of the cable can be applied by flame or by induction heating with an electric current by known methods.

[Brief description of drawings]

The accompanying drawings show an embodiment according to the proposed method,
FIG. 1 is a schematic diagram showing winding of a filament on a rotating pitch cable together with application of an adhesive, and FIG. 2a is a schematic diagram showing winding of a filament when the pitch cable does not rotate, and FIG. FIG. 2c is an enlarged view in the direction of arrows b and c in FIG. 2a. 1 ... Pitch cable, 2 ... Threaded coil winding, 3 ...
... carriage, 4 ... spool, 5 ... filament, 6 ...
… Nozzle, 8,9 …… Wheel electrode, 10 …… Power supply, 11 ……
Plate, 12 …… Spool, 13 …… Counterweight,
14 …… Plate, B, C, D …… Arrow

Claims (1)

[Claims] 1. A flocked filament or tape is provided between turns of a pitch cable to provide a friction and noise reduction interlining on the pitch cable consisting of the wire rope and a helical winding wound around the wire rope. In the winding method, the flocked filament is made of a thermoplastic and the pitch cable is heated to a temperature above the melting point of the thermoplastic before or after winding the flocked filament to melt the flock or fluff of the filament. And a friction and noise reduction interlining on a pitch cable characterized by being welded to metal.